springmvc注入類 NoUniqueBeanDefinitionException: No qualifying bean of type [] is defined: expected single錯誤 - 碼上快樂

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springmvc注入類 NoUniqueBeanDefinitionException: No qualifying bean of type [] is defined: expected single錯誤

本文轉載自查看原文 2017-11-14 20:07 7606 Java/ SpringMVC/ MVC

在springmvc中注入服務時用@Service

當有兩個實現類時都標明@Service后則會出現異常：

nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [com.james.dao.impl.BaseDao] is defined: expected single matching bean but found 2:

這是因為都標明了@Service會自動注入，這時會導致不清楚實際運行時實例化哪一類。

解決：

方法一

實際運用哪一個實現類就在哪個類上注入@Service，另外一個不標注

方法二

都不標注@Service，在resource文件夾中配置 applicationContext.xml，表明實際運行哪個實現類。

<bean id="serviceImpl" class="com.james.service.impl.ServiceImpl"></bean>

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